backend: xrender: set created picture to repeat when binding a pixmap

[absolutelynothelix]

set created picture to repeat when binding a pixmap in the xrender backend. see #1002 for gl-powered backends.

related issue: #970

[codecov]

Codecov Report

Merging #1000 (ecbc8b5) into next (5e22434) will increase coverage by 0.14%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             next    #1000      +/-   ##
==========================================
+ Coverage   37.51%   37.66%   +0.14%     
==========================================
  Files          49       49              
  Lines       11171    11171              
==========================================
+ Hits         4191     4207      +16     
+ Misses       6980     6964      -16     

Impacted Files	Coverage Δ
src/backend/xrender/xrender.c	0.00% <0.00%> (ø)

... and 2 files with indirect coverage changes

[absolutelynothelix]

@tryone144, do you have an idea how to implement this in gl-powered backends? i assume that we're supposed to use the effective width and height of the texture we're using in the gl_compose function because they're completely unused now.

[tryone144]

Let me take a look at it. I am pretty sure the gl backends don't make use of the effective width and hight when composing...

Edit: Let me try something, this isn't the real issue here...
Edit2: Found the issue. Rounded corners don't play nice with smaller textures than effective size...

[tryone144]

The rounded corner calculation in the window shader broke this for opengl... See #1002 for the fix.

[absolutelynothelix]

@tryone144, nice, thank you! i don't think that i could figure this out myself.